housemate, paul. >> grace is perfect for me. one is okay. i'm 67 next birthday here. >> reporter: so rachel is looking for a new dad on line. >> i'm raising her with my co-parenting partner, paul. who i met through modamily. modfamily is a mash up of mom dad and family. >> reporter: and modamily is a number of new sites matching co-parents. compatible partners for creating a child. >> facebook for fetuses. >> to find fetus, yeah. >> reporter: a dating site that cuts straight to the divorce. what happens when they meet that special somebody? >> see a lawyer. get a co-parenting agreement, get background and health checks and discuss how you are going to get pregnant and financial cost and custody. >> reporter: more than 5,000 people signed up on this site alone. there are other co-parenting sites, too. legally it is unchartered territory. lawyers we spoke with said making babies this way could be fraught with potential pitfalls. that doesn't bother rachel. it all sounds a little bit unromantic. >> it is. i like it that way. >> reporter: she said parenthood is a big decision.